Method of welding



' 1. L. ANDERSON. V METHOD OF WELDING. APPLICATION FILED DEC. 5, I919. RENEWED NOV. 26, 1921.

1 ,996.. Patented Jan. 10, 1922 A TTOH/VE Y UNITED STATES,

James L. ANnEnsoN, or BAYONNE, NEW me COMPANY, or NEW roan, N.

PATENT 0mm.

METHOD OF WELDING.

Specification of Letters Patent.

Patented Jan. 10, 1922.

Application filed Decemher 1919, Serial No. 342,768. Renewed November 26, 1921. Serial No. 518,071,

5 To all whom it may concern Be it known that 1, JAMES L. ANDEnsoN, a citizen of the United States, and resident of Bayonne, in the .countyof Hudson and State of New 'Jersey, have invented a new and useful Improvement in Methods of Welding, of which the following 1s a specification.

In my copending application, Serial No. 317,281, filed August 13, 1919, l have described a method of progressively hutt welding longitudinal seams, particularly of tubing, by the oxyacetylene for like autogenous welding flame, which method 1s characterized by the employment of jets dlsposed for a distance lengthwise of the seam and spaced at opposite sides of the center, so that the heat is applied back of the seam edges rather than in the crevice, while the interior of the tube may be filled with a difiused flame and unburned gas from the central part of the envelope, of a reducing and annealing character. This mode of welding results in important advantages, in" respect to the strength of the weld, avoidance of waste, ease ofcontroh and speed of production, which are set forth in the said application.- The typical flame grouping for this process comprises spaced lOllgltlldl: nal rows of jets, but other specific arrangeme'nts may be used, some of which are disclosed in another application, Serial No.

317,282, filed August 13, 1919, relating to forms of torch'suitable for carrying out the process. I now find that when the preheating and welding are performed with a double or spread flame, followed by one or more'central jets, a further advantage is se cure in that the central jet or jets lay the piled-up metal of the we ded section thus produc ng a smoother weld, more favorable.

for mechanical finishing operations, and

avoiding any possibility of the 5, rearward spaced welding jets leaving gouge ,marks.

In the accompanying drawings "illustrating thlei-fimprovement;

' Fig, 2 is a, lan, showing the fise ofdparallela-gews an twocentral jets in tan e Fig." 3 is a diagrammatic 'plan showing another flame-arrangement; and

Fi 4 is a diagrammatic view illustrat ingt eaction ofthe jetsg Continuous relative longitudinal movethe workis stationary and the torch is direction if it ment is produced between the tube 2 and the "torch 3, this being obtained in practice by driving the tube with itsseam uppermost beneath the torch, the latter being suitably supported in a stationary manner, With provision for appropriate adjustment. The tube is typically held and driven by rollers including a pair 4: on vertical axes in rear 0 the region of fusion. These rollers are regularly provided with transverse adjusting Fig. 2, this roller being equipped with a7 I guide fin 10 operating in the open seam.

In the case of barrel or other larger tn-- bular bodies, or for flat or prismatic work,

driven. Y

The oxyacetylene flame here employed comprises jets 5yin parallel or converging lines or equivalent relation, straddling the seam, with one or more jets 6 in rear of the welding jets located centrally or close to the center line. By the jets 5 the portions of the tube wall at opposite sides'of the seam are successively preheated and melted and caused to unite. Toward the rear third,

more or less, of the, collection, where. the welding takes place, a broad "wave 8 of the molten? material is formed, andtends to flow around behind and pile up in an elevated ridge, the sides of which may be sharply dcmarked by'the plowing action of the last double jets.

This accumulation, however, while still molten, is acted upon by the central jet or jets 6,,which cause the. metal to flow laterally. According to the number and size of these jets the weld canbe left full and somewhat raised or substantiallyflat, as

desired. Where the tubing,is subsequently to; ;.he drawnon-swaged, a raised weld is dis- .advantageousfwtending vto cause crimping,

and under such circumstances the invention 1 I iifmakes it possible to obtainfa substantially ig. '1 is a perspective view show ng tub- 1 .ing being welded in the man-nor described;

smcoth surface. In other cases.. extra thick ness is desired, which can be secured while 5 avoiding sharp ridging.

1 of the seam andweld. The lower arrow represents the fiirection of movement if the .Work is driven, and the upper arrow the is the torch which is moved.

4 rummagin action Tot the jets. 1

' the process.

The first three jets are preheating the metal at opposite sides of the seam. Beneath the fourth pair the edges commence to :fuse, and the meltin is carried deeper beneath the fifth and slxth pairs, piling up behind the jets in the manner indicated. At this point the seam may be understood to have been fused to its full depth, and there is a substantial accumulation of metal, which the central jets 6 proceed to disperse.

The flame elements may be arranged in numerous specifically different ways, some of which are indicated in an application filed of even date herewith covering embodiments of a torch suitable for carrying out Fig. 1 shows the use of two roivs and a single central jet at the rear;

Fig. 2 illustrates two parallel rows and two 1 rear central jets in'tandem; and Fig. 3 represents an instance of rows of jets 5 which converge to a single jet 6, at the back.

In some cases the leading or preheating jets .can be supplied with-cheaper-gases than the oxyacetylene mixture, producing a lower temperature serviceable however for preheating.

What I claim as new is:

1. The herein described method of buttwelding seams which comprises progressively heating and fusing asubstantial section by the application of a longitudinally extending, transversely spread group of jets,

and acting upon thepiled-up material in rear of the welding point by one-or more flame jets applied at or close to the center line of the seam.

2. The method of welding tubing, which 3. The method of welding tubing, which comprises. progressively heating and fusing the margins of the seam by the application of the intensely heated points of a plurality of welding jets at opposite sides of the seam at regions somewhat removed from the edges, succeeded by a jet of similar character acting substantially in the central line? 4. Improvement in the method of progressively butt-welding seams by the application of the intensely heated points of rows or lines of autogenous welding-jets at opposite sides of the seam removed from the edges, to fuse the edge regions and cause them to flow together, characterized by the application toward the rear of said jets of one or more finishing jets acting substantially in the central longitudinal line.

JAMES L. ANDERSON. 

